Who called from 6202061737

Called my cell 5/25/17 - no message - blocked   Caller ID just said Cedar Vale, KS 620-206-1737

I've been picking up these calls just to see what they're about. In this case, picked up, line was silent for about 2 seconds, and then the caller hung up.

Called my cell phone May 23.  2017. 4pm. Don't answer if don't know.  No message.  No pressure.  Just some blockage.

Called my cell.. I saw number I don't know so pushed call reject. Now it's blocked on my phone with a ton of other unwanted numbers.  Make this stop

Received call on May 31 2017 1230pm answered and nothing was said they hung up